Gave this a try but after launching 'JustWrite' could find no apparent way of quitting it; pressed the escape key on my MacBook Pro's keyboard but nada.
Put my cursor to the top of the screen in hope of finding a menu bar but still nada.
Nothing at the bottom of the screen except settings for font style, font size and font color.
Had to hard shut down my mac using the power button to get out of 'JustWrite'.
Am I missing something or is there a problem with the app?